3 Replies Latest reply on Dec 3, 2016 1:45 PM by user_252

    Interrupt Default Handler Endless Loop


      I've got a project for the CYBLE-222005 module that I'm debugging. After one of the function calls returns success IntDefaultHandler is called automatically in Cm3Start.c. This is a generated source file and the comments inside this function state


          * We must not get here. If we do, a serious problem occurs, so go into
          * an infinite loop.


      I'm not sure how we got here or how I can go about debugging this further. The project does not use any interrupts which makes this even more puzzling.


      Any help with this would be greatly appreciated.







        • 1. Re: Interrupt Default Handler Endless Loop

          The handler is called when an NMI or hardware interrupt occured. Check stack violation. Think of posting your complete project, so that we all can have a look at all of your settings. To do so, use
          Creator->File->Create Workspace Bundle (minimal)
          and attach the resulting file. Give some information on which return the problem happens.





          • 2. Re: Interrupt Default Handler Endless Loop

            Hi Bob,


            Thanks for looking and replying. I've attached the project which is based on AN84858. The Project I am debugging is A_Hssp_Programmer. The "Host" is a CY8CKIT-059 board with a LCD attached and the target is a CYBLE-222005-EVAL board.




            You'll see that I've added LCD output statements after each step. The last message displayed is Verify, Step 06, ArrayID=0. This means that I've programmed the flash and then also verified it. ProgramProtectionSettings is the function call that causes the code to go into the endless while loop. That function is in ProgrammingSteps.c and I added a LCD debug output at the end of this function.


            If I single step through the code at this point the return(SUCCESS) statement causes a jump to CyPmHviLviRestore (in CyPm.c) and somehow that is calling CY_ISR which is where I get stuck in the endless while loop.


            I'll take a look at the stack and see if I can uncover anything there.







            • 3. Re: Interrupt Default Handler Endless Loop

              Here's what the stack looks like when it enters the CyISR routine: